This document is licensed under a Creative Commons Attribution 3.0 License.
This document specifies custom datatypes designed to concisely encode important information.
This document is draft of a potential specification. It has no official standing of any kind and does not represent the support or consensus of any standards organization.
Being able to describe quantity values and their unit is a requirement that is common for many applications in several industrial sectors such as manufacturing, transport and logistics, personal and public health, smart cities, energy, environment, buildings, agriculture. Different ontologies have been developed to describe units, their relations, and quantities with their values.
We propose an alternative approach based on RDF Datatypes [rdf11concepts], that leverages the Unified Code of Units of Measures [UCUM], a code system intended to
The custom datatypes introduced in this section can be used for lightweight encoding and querying of quantity values, in a wide range of applications where representing and reasoning with quantity kinds and values is more important than reasoning with units.
This section is nonnormative.
Main datatypes: cdt:ucum , cdt:ucumunit
Current list of more specific datatypes: cdt:acceleration , cdt:amountOfSubstance , cdt:angle , cdt:area , cdt:catalyticActivity , cdt:dimensionless , cdt:electricCapacitance , cdt:electricCharge , cdt:electricConductance , cdt:electricCurrent , cdt:electricInductance , cdt:electricPotential , cdt:electricResistance , cdt:energy , cdt:force , cdt:frequency , cdt:illuminance , cdt:length , cdt:luminousFlux , cdt:luminousIntensity , cdt:magneticFlux , cdt:magneticFluxDensity , cdt:mass , cdt:power , cdt:pressure , cdt:radiationDoseAbsorbed , cdt:radiationDoseEffective , cdt:radioactivity , cdt:solidAngle , cdt:speed , cdt:temperature , cdt:time , cdt:volume
RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#ucumunit
Definition  UCUM Unit Datatype  Datatype to encode measurement units in a simple literal. 

Lexical space  Any unit expression constructed using The Unified Code for Units of Measure code system. 
Value space Includes  Set of units as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps UCUM unit expressions to a unit semantic element according to the International Systems of Quantities. 
Examples 
For example, all literals below are well formed, and share the same value. "km.h1"^^cdt:ucumunit
"km/h"^^cdt:ucumunit
"(1000m)/(60min)"^^cdt:ucumunit

RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#ucum
Definition  UCUM Datatype  Datatype to encode measurements in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a unit expression constructed using The Unified Code for Units of Measure code system. 
Value space Includes  Set of measures, or quantity values as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a UCUM unit expression to their corresponding measures according to the International Systems of Quantities. 
Examples 
Check out the playground For example, all literals below are well formed, test them online and share the same value. "1 m"^^cdt:ucum
"1.0e+9 nm"^^cdt:ucum
"1e+10 Ao"^^cdt:ucum
"1 m/s.s"^^cdt:ucum

RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#acceleration
Definition  acceleration Datatype  Datatype to encode measurement of quantity kind acceleration in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and an acceleration unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of acceleration as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a acceleration UCUM unit expression to their corresponding acceleration measures according to the International Systems of Quantities. 
Examples 
For example, all acceleration literals below are well formed, test them online. "1 m/s2 "^^cdt:acceleration # S.I. "3.8 [g]"^^cdt:acceleration # standard acceleration of free fall "1.57e2 cm/s2"^^cdt:acceleration # S.I. equiv. of Gal "1.57e2 Gal"^^cdt:acceleration # Gal 
RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#amountOfSubstance
Definition  amountOfSubstance Datatype  Datatype to encode measurement of quantity kind amountOfSubstance in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and an amountOfSubstance unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of amountOfSubstance as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a amountOfSubstance UCUM unit expression to their corresponding amountOfSubstance measures according to the International Systems of Quantities. 
Examples 
For example, the amountOfSubstance literal below is well formed. "1.2 mol"^^cdt:amountOfSubstance

RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#angle
Definition  angle Datatype  Datatype to encode measurement of quantity kind angle in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and an angle unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of angle as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a angle UCUM unit expression to their corresponding angle measures according to the International Systems of Quantities. 
Examples 
For example, all angle literals below are well formed, test them online. "360 deg"^^cdt:angle # degree "1 '"^^cdt:angle # minute "1 ''"^^cdt:angle # second "1 rad"^^cdt:angle # radian "1 circ"^^cdt:angle # circle 
RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#area
Definition  area Datatype  Datatype to encode measurement of quantity kind area in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and an area unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of area as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a area UCUM unit expression to their corresponding area measures according to the International Systems of Quantities. 
Examples 
For example, all area literals below are well formed, test them online. "1 m2"^^cdt:area # square meter
"1 ar"^^cdt:area # are
"1 [sin_i]"^^cdt:area # square inch International customary units
"1 [in_i]2"^^cdt:area # square inch International customary units
"1 [smi_us]"^^cdt:area # square mile Older U.S. “survey” lengths (also called "statute" lengths)

RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#catalyticActivity
Definition  catalyticActivity Datatype  Datatype to encode measurement of quantity kind catalyticActivity in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a catalyticActivity unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of catalyticActivity as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a catalyticActivity UCUM unit expression to their corresponding catalyticActivity measures according to the International Systems of Quantities. 
Examples 
For example, all catalyticActivity literals below are well formed, test them online. "1 mol/s"^^cdt:catalyticActivity # mole per second "1 kat"^^cdt:catalyticActivity # KATAL "1 U"^^cdt:catalyticActivity # Unit 
RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#dimensionless
Definition  dimensionless Datatype  Datatype to encode measurement of quantity kind dimensionless in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a dimensionless unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of dimensionless as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a dimensionless UCUM unit expression to their corresponding dimensionless measures according to the International Systems of Quantities. 
Examples 
For example, all dimensionless literals below are well formed, test them online. "1 "^^cdt:dimensionless # Unit (empty string)
"1 [pi]"^^cdt:dimensionless # pi
"1 %"^^cdt:dimensionless # percent
"1 [ppth]"^^cdt:dimensionless # parts per thousand
"1 [ppm]"^^cdt:dimensionless # parts per million
"1 [ppb]"^^cdt:dimensionless # parts per billion
"1 [pptr]"^^cdt:dimensionless # parts per trillion

RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#electricCapacitance
Definition  electricCapacitance Datatype  Datatype to encode measurement of quantity kind electricCapacitance in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and an electricCapacitance unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of electricCapacitance as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a electricCapacitance UCUM unit expression to their corresponding electricCapacitance measures according to the International Systems of Quantities. 
Examples 
For example, all electricCapacitance literals below are well formed, test them online. "1 C/V"^^cdt:electricCapacitance # coulomb per volt "1 F"^^cdt:electricCapacitance # farad 
RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#electricCharge
Definition  electricCharge Datatype  Datatype to encode measurement of quantity kind electricCharge in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and an electricCharge unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of electricCharge as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a electricCharge UCUM unit expression to their corresponding electricCharge measures according to the International Systems of Quantities. 
Examples 
For example, all electricCharge literals below are well formed, test them online. "1 C"^^cdt:electricCharge # coulomb
"1 [e]"^^cdt:electricCharge # elementary charge

RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#electricConductance
Definition  electricConductance Datatype  Datatype to encode measurement of quantity kind electricConductance in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and an electricConductance unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of electricConductance as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a electricConductance UCUM unit expression to their corresponding electricConductance measures according to the International Systems of Quantities. 
Examples 
For example, all electricConductance literals below are well formed, test them online. "1 /Ohm"^^cdt:electricConductance # inverse of Ohm "1 Ohm1"^^cdt:electricConductance # inverse of Ohm "1 S"^^cdt:electricConductance # siemens 
RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#electricCurrent
Definition  electricCurrent Datatype  Datatype to encode measurement of quantity kind electricCurrent in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and an electricCurrent unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of electricCurrent as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a electricCurrent UCUM unit expression to their corresponding electricCurrent measures according to the International Systems of Quantities. 
Examples 
For example, all electricCurrent literals below are well formed, test them online. "1 C/s"^^cdt:electricCurrent # coulomb per second "1 A"^^cdt:electricCurrent # ampère "1 mA"^^cdt:electricCurrent # milliampère "1 Bi"^^cdt:electricCurrent # Biot 
RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#electricInductance
Definition  electricInductance Datatype  Datatype to encode measurement of quantity kind electricInductance in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and an electricInductance unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of electricInductance as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a electricInductance UCUM unit expression to their corresponding electricInductance measures according to the International Systems of Quantities. 
Examples 
For example, all electricInductance literals below are well formed, test them online. "1 Wb/A"^^cdt:electricInductance # weber per ampère "1 V.s/A"^^cdt:electricInductance # volt second per ampère "1 H"^^cdt:electricInductance # henry 
RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#electricPotential
Definition  electricPotential Datatype  Datatype to encode measurement of quantity kind electricPotential in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and an electricPotential unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of electricPotential as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a electricPotential UCUM unit expression to their corresponding electricPotential measures according to the International Systems of Quantities. 
Examples 
For example, all electricPotential literals below are well formed, test them online. "230.7 V"^^cdt:electricPotential
"2.307e2 V"^^cdt:electricPotential
".2307 kV"^^cdt:electricPotential
".2307 J/C"^^cdt:electricPotential

RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#electricResistance
Definition  electricResistance Datatype  Datatype to encode measurement of quantity kind electricResistance in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and an electricResistance unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of electricResistance as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a electricResistance UCUM unit expression to their corresponding electricResistance measures according to the International Systems of Quantities. 
Examples 
For example, all electricResistance literals below are well formed, test them online. "1 V/A"^^cdt:electricResistance "1 Ohm"^^cdt:electricResistance # Ohm "1 kOhm"^^cdt:electricResistance # kiloOhm "1 mOhm"^^cdt:electricResistance # milliOhm "1 MOhm"^^cdt:electricResistance # MegaOhm 
RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#energy
Definition  energy Datatype  Datatype to encode measurement of quantity kind energy in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and an energy unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of energy as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a energy UCUM unit expression to their corresponding energy measures according to the International Systems of Quantities. 
Examples 
For example, all energy literals below are well formed, test them online. "1 kg.m2/s2"^^cdt:energy # S.I. unit for energy "1 N.m"^^cdt:energy # Newton meter "1 W.s"^^cdt:energy # Watt second "1 kW.h"^^cdt:energy # kiloWatt hour "1 erg "^^cdt:energy # erg "1 eV"^^cdt:energy # electronvolt "1 J"^^cdt:energy # joule "1 cal"^^cdt:energy # calorie "1 [Cal]"^^cdt:energy # nutrition label Calories 
RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#force
Definition  force Datatype  Datatype to encode measurement of quantity kind force in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a force unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of force as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a force UCUM unit expression to their corresponding force measures according to the International Systems of Quantities. 
Examples 
For example, all force literals below are well formed, test them online. "1 kg.m/s2"^^cdt:force # S.I. equiv. of Newton "1 N"^^cdt:force # Newton "1 gf"^^cdt:force # gramforce "1 g.[g]"^^cdt:force # definition of gramforce "1 dyn"^^cdt:force # dyne "1 g.cm/s2"^^cdt:force # S.I. equiv. of dyne 
RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#frequency
Definition  frequency Datatype  Datatype to encode measurement of quantity kind frequency in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a frequency unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of frequency as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a frequency UCUM unit expression to their corresponding frequency measures according to the International Systems of Quantities. 
Examples 
For example, all frequency literals below are well formed, test them online. "1 Hz"^^cdt:frequency # Hertz "1 MHz"^^cdt:frequency # MegaHertz "1 s1"^^cdt:frequency # per second "1 /s"^^cdt:frequency # per second "1 1/s"^^cdt:frequency # per second 
RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#illuminance
Definition  illuminance Datatype  Datatype to encode measurement of quantity kind illuminance in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and an illuminance unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of illuminance as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a illuminance UCUM unit expression to their corresponding illuminance measures according to the International Systems of Quantities. 
Examples 
For example, all illuminance literals below are well formed, test them online. "1 lm/m2"^^cdt:illuminance # lumen per square meter "1 lx"^^cdt:illuminance # lux "1 ph"^^cdt:illuminance # phot 
RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#length
Definition  length Datatype  Datatype to encode measurement of quantity kind length in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a length unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of length as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a length UCUM unit expression to their corresponding length measures according to the International Systems of Quantities. 
Examples 
For example, all length literals below are well formed, test them online. "1 km"^^cdt:length
"1.609344E+6 mm"^^cdt:length
"5280 [ft_i]"^^cdt:length

RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#luminousFlux
Definition  luminousFlux Datatype  Datatype to encode measurement of quantity kind luminousFlux in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a luminousFlux unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of luminousFlux as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a luminousFlux UCUM unit expression to their corresponding luminousFlux measures according to the International Systems of Quantities. 
Examples 
For example, all luminousFlux literals below are well formed, test them online. "1 lm"^^cdt:luminousFlux # lumen

RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#luminousIntensity
Definition  luminousIntensity Datatype  Datatype to encode measurement of quantity kind luminousIntensity in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a luminousIntensity unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of luminousIntensity as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a luminousIntensity UCUM unit expression to their corresponding luminousIntensity measures according to the International Systems of Quantities. 
Examples 
For example, all luminousIntensity literals below are well formed, test them online. "1 cd"^^cdt:luminousIntensity # candela

RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#magneticFlux
Definition  magneticFlux Datatype  Datatype to encode measurement of quantity kind magneticFlux in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a magneticFlux unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of magneticFlux as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a magneticFlux UCUM unit expression to their corresponding magneticFlux measures according to the International Systems of Quantities. 
Examples 
For example, all magneticFlux literals below are well formed, test them online. "1 Wb"^^cdt:magneticFlux # weber

RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#magneticFluxDensity
Definition  magneticFluxDensity Datatype  Datatype to encode measurement of quantity kind magneticFluxDensity in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a magneticFluxDensity unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of magneticFluxDensity as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a magneticFluxDensity UCUM unit expression to their corresponding magneticFluxDensity measures according to the International Systems of Quantities. 
Examples 
For example, all magneticFluxDensity literals below are well formed, test them online. "1 Wb/m2"^^cdt:magneticFluxDensity # weber per square meter "1 T"^^cdt:magneticFluxDensity # tesla "1 G"^^cdt:magneticFluxDensity # gauss 
RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#mass
Definition  mass Datatype  Datatype to encode measurement of quantity kind mass in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a mass unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of mass as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a mass UCUM unit expression to their corresponding mass measures according to the International Systems of Quantities. 
Examples 
For example, all mass literals below are well formed, test them online. "1 g"^^cdt:mass # gram
"1 kg"^^cdt:mass # kilogram
"1 t"^^cdt:mass # tonne
"1 u"^^cdt:mass # unified atomic mass unit
"1 [m_e]"^^cdt:mass # electron mass
"1 [gr]"^^cdt:mass # grain (avoirdupois weight system)
"1 [oz_av]"^^cdt:mass # ounce (avoirdupois weight system)

RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#power
Definition  power Datatype  Datatype to encode measurement of quantity kind power in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a power unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of power as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a power UCUM unit expression to their corresponding power measures according to the International Systems of Quantities. 
Examples 
For example, all power literals below are well formed, test them online. "1 J/s"^^cdt:power # joule per second "1 W"^^cdt:power # watt "1 [ft_i].[lbf_av]/s"^^cdt:power # definition of horse power "1 [HP]"^^cdt:power # horsepower 
RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#pressure
Definition  pressure Datatype  Datatype to encode measurement of quantity kind pressure in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a pressure unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of pressure as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a pressure UCUM unit expression to their corresponding pressure measures according to the International Systems of Quantities. 
Examples 
For example, all pressure literals below are well formed, test them online. "1 Pa"^^cdt:pressure # pascal
"1 bar"^^cdt:pressure # bar
"1 atm"^^cdt:pressure # standard atmosphere
"1 att"^^cdt:pressure # technical atmosphere

RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#radiationDoseAbsorbed
Definition  radiationDoseAbsorbed Datatype  Datatype to encode measurement of quantity kind radiationDoseAbsorbed in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a radiationDoseAbsorbed unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of radiationDoseAbsorbed as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a radiationDoseAbsorbed UCUM unit expression to their corresponding radiationDoseAbsorbed measures according to the International Systems of Quantities. 
Examples 
For example, all radiationDoseAbsorbed literals below are well formed, test them online. "1 erg/g"^^cdt:radiationDoseAbsorbed # erg per gram "1 RAD"^^cdt:radiationDoseAbsorbed # radiation absorbed dose 
RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#radiationDoseEffective
Definition  radiationDoseEffective Datatype  Datatype to encode measurement of quantity kind radiationDoseEffective in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a radiationDoseEffective unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of radiationDoseEffective as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a radiationDoseEffective UCUM unit expression to their corresponding radiationDoseEffective measures according to the International Systems of Quantities. 
Examples 
For example, all radiationDoseEffective literals below are well formed, test them online. "1 J/kg"^^cdt:radiationDoseEffective # Joule per kilogram "1 Sv"^^cdt:radiationDoseEffective # sievert 
RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#radioactivity
Definition  radioactivity Datatype  Datatype to encode measurement of quantity kind radioactivity in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a radioactivity unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of radioactivity as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a radioactivity UCUM unit expression to their corresponding radioactivity measures according to the International Systems of Quantities. 
Examples 
For example, all radioactivity literals below are well formed, test them online. "1 s1"^^cdt:radioactivity # per second
"1 Bq"^^cdt:radioactivity # becquerel
"1 Ci"^^cdt:radioactivity # Curie

RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#solidAngle
Definition  solidAngle Datatype  Datatype to encode measurement of quantity kind solidAngle in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a solidAngle unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of solidAngle as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a solidAngle UCUM unit expression to their corresponding solidAngle measures according to the International Systems of Quantities. 
Examples 
For example, all solidAngle literals below are well formed, test them online. "1 sr"^^cdt:solidAngle # steradian
"1 sph"^^cdt:solidAngle # sphere

RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#speed
Definition  speed Datatype  Datatype to encode measurement of quantity kind speed in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a speed unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of speed as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a speed UCUM unit expression to their corresponding speed measures according to the International Systems of Quantities. 
Examples 
For example, all speed literals below are well formed, test them online. "120 m/s"^^cdt:speed # meter per second "90 km/h"^^cdt:speed # kilometer per hour "90 km.h1"^^cdt:speed # kilometer per hour 
RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#temperature
Definition  temperature Datatype  Datatype to encode measurement of quantity kind temperature in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a temperature unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of temperature as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a temperature UCUM unit expression to their corresponding temperature measures according to the International Systems of Quantities. 
Examples 
For example, all temperature literals below are well formed, test them online. "273.15 K"^^cdt:temperature # kelvin
"37.5 Cel"^^cdt:temperature # degree Celsius
"100 [degF]"^^cdt:temperature # degree Fahrenheit
"100 [degR]"^^cdt:temperature # degree Rankine
"100 [degRe]"^^cdt:temperature # degree Réaumur

RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#time
Definition  time Datatype  Datatype to encode measurement of quantity kind time in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a time unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of time as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a time UCUM unit expression to their corresponding time measures according to the International Systems of Quantities. 
Examples 
For example, all time literals below are well formed, test them online. "1 ns"^^cdt:time # nanosecond
"1 s"^^cdt:time # second
"1 min"^^cdt:time # minute
"1 h"^^cdt:time # hour
"1 d"^^cdt:time # day
"1 a_t"^^cdt:time # tropical year
"1 a_j"^^cdt:time # mean Julian year
"1 a_g"^^cdt:time # mean Gregorian year
"1 a"^^cdt:time # year
"1 wk"^^cdt:time # week
"1 mo_s"^^cdt:time # synodal month
"1 mo_j"^^cdt:time # mean Julian month
"1 mo_g"^^cdt:time # mean Gregorian month
"1 mo"^^cdt:time # month

RDF Datatype with IRI: http://w3id.org/lindt/custom_datatypes#volume
Definition  volume Datatype  Datatype to encode measurement of quantity kind volume in a simple literal. 

Lexical space  Concatenation of the lexical form of an xsd:decimal , optionally followed by e or E and the lexical form of an xsd:integer , at least one space, and a volume unit expression constructed using The Unified Code for Units of Measure code system 
Value space Includes  Set of volume as defined by the International Systems of Quantities. 
Lexicaltovalue mapping  Maps lexical forms with a volume UCUM unit expression to their corresponding volume measures according to the International Systems of Quantities. 
Examples 
For example, all volume literals below are well formed, test them online. "1 L"^^cdt:volume # liter
"1 dm3"^^cdt:volume
"1 m3"^^cdt:volume # cubic meter
"1 m.m.m"^^cdt:volume # cubic meter
"100 [cin_i]"^^cdt:volume # cubic inch (International customary units)
"100 [gal_br]"^^cdt:volume # gallon (British Imperial volumes)
"100 [pt_br]"^^cdt:volume # pint (British Imperial volumes)

See https://github.com/OpenSensingCity/jenaucum
Features
xsd:int
, xsd:decimal
, xsd:float
, xsd:double
)arg1
, arg2
) to check if two measurement literals are commensurable (returns a xsd:boolean
).